What values need to be selected in obv indicator for source and volume?

In source there are 3 options- low,close ,vlome.

and in volume also there are 3 options low,close and volume.

what needs to be selected in both ?

please also explain which combination of source & volume has what impact on chart??

It depends on which you what to Refer and plot the indicator if you are referring with close price you can select based on close , and it will show with close of the candle price/volume